Agree wid neha vij.

The birth weight should double itself in six months so analyse accordingly. If she was 3 kgs she should be 6 or more by six months

Go through this link, it will be helpful for you

<font color ="#3b5998"><b><a href="http://app.babychakra.com/article/1100">The Ultimate Height and Weight tracker for little Girls</a></b></font>